name , client id in menu

[PatmanSan]

You wont be able to show the result of a dvar if you use the action{} element in an itemDef{}. Also, you aren't defining the font and fontstyle and size. It wont show unless you do that.

		itemDef
		{
			name			rcon_button
			type			ITEM_TYPE_BUTTON
			dvar			"rcon_rsp_player0"
			rect			0 0 SLOT_SIZE
			origin			ORIGIN_SLOT
			textstyle		OPTIONS_ITEM_TEXT_STYLE
			textalign		OPTIONS_ITEM_ALIGN
			textalignx		SLOT_ALIGNX
			textaligny		SLOT_ALIGNY
			textscale		SLOT_TXTSCALE
			style			WINDOW_STYLE_FILLED
			backcolor		OPTIONS_CONTROL_BACKCOLOR
			forecolor		OPTIONS_CONTROL_FORECOLOR
			visible			1
			dvartest		"rcon_rsp_result"
			showDvar		{ "1" }
			action
			{
				play "mouse_click";
				scriptMenuResponse "rcon_cmd_player0";
			}
			mouseEnter
			{
				play "mouse_over";
			}
		}

Using a dvar as text, checking dvar to show at all, and with an action... shows perfectly fine.